Highly Efficient Photochemical Vapor Generation For Sensitive Determination Of Trace Inorganic Tin By Inductively Coupled Plasma Mass Spectrometry
Jing Hu, Xiandeng Hou
Abstract
The determination of trace inorganic tin was achieved by inductively coupled plasma mass spectrometry (ICP-MS) with photochemical vapor generation (PVG) in acetic acid medium for efficient sample introduction.The critical factors influencing PVG process including PVG reaction medium, UV exposure time, concomitant ions, and the flow rate of carrier gas were investigated; and the possible mechanism of the photochemical reaction was experimentally studied and discussed.With Cd 2+ and Cl -as sensitizers, the analytical sensitivity was enhanced about 15-fold compared to that of the PVG without sensitizers.Under optimal experimental conditions, undifferentiated PVG-ICP-MS response was obtained for Sn(II) and Sn(IV), and the limit of detection (LOD) for inorganic tin was found to be 1.4 ng•L -1 .The accuracy of the proposed method was verified by analysis of a certified water sample of tin (BWZ6705-2016).The method was further applied to the direct analysis of white vinegar and tap water samples for trace inorganic tin, with analytical results consistent with those from PN-ICP-MS and spike recoveries between 90% and 94%.